Calculating machines



O t, 4, 1960 K. LEICH ETAL CALCULATING MACHINES '7 Sheets-Sheet 1 FiledApril 19, 1956 55, Z y ZM e @zfm r I-LH 1L 2 Z w Oct. 4, 1960 2,954,924

CALCULATING MACHINES Filed April 19, 1956 7 Sheets-Sheet 2 Oct. 4, 1960LE'CH ETAL 2,954,924

CALCULATING MACHINES Filed April 19, 1956 7 Sheets-Sheet 4 Oct. 4, 1960K. LEIGH EIAL 2,954,924

CALCULATING MACHINES Filed April 19, 1956 7 Sheets-Sheet 6 [rive/760mKARL L 5/ c h y EaEeHmo ML-Wqs Oct. 4, 1960 LE'CH 2,954,924

CALCULATING MACHINES Filed April 19, 1956 7 Sheets-Sheet '7 Fig. 72

INVENTORS (A?! LF/ff/ EBEE/ MPD 4454 65 CALCULATING MA'CHINES KarlLeich, Lebenstedt over Braunschweig, and Eberhard Menge, Braunschweig,Germany, assignors t Brunsviga Maschinenwerke A.G., Braunschweig,Germany Filed Apr. '19, 1956, Ser. No. 579,293

Claims priority, application Germany Apr. 23, 1955 Claims. (Cl. 235-63)The present invention relates to calculating machines, and moreparticularly to a ten digit key calculating machine having a rotarydifferential actuator supported in an ordinally shiftable carriage, astationary accumulator, and a stationary counter for registering thenumber of revolutions of the actuator.

Calculating machines of the kind described hereinabove are disclosed inGerman Patent 907,836, corresponding to U.S. patent application SerialNo. 323,411, filed December l, 1952, in the name of Eberhard Menge,issued as U.S. Patent No. 2,879,938 on March 31, 1959.

It is an object of the present invention to improve the mechanismdescribed in German Patent No. 907,836, corresponding to theabove-mentioned U.S. patent.

It is another object of the present invention to provide aretransmitting mechanism including devices for shifting the actuatorcarriage from its initial rightmost position to a predetermined ordinalposition.

It is a further object of the present invention to provide a mechanismallowing a retransmitted item to be transferred into the revolutionscounter directly after the retransmission thereof.

It is still another object of the present invention to provide amechanism allowing a retransmitted item to be transferred into theaccumulator.

Further objects and advantages will become apparent from the followingdescription of the invention taken in conjunction with the figures, inwhich:

Fig. 1 is a plan view of part of the mechanism of a calculating machineaccording to the present invention;

Fig. 2 is a side elevation, partly in section, on an enlarged scale ofone of the keys shown in Fig. 1 and the control slides associatedtherewith;

Fig. 3 is a side elevation, partly in section, along the line III-III ofFig. 1;

Fig. 4 is a plan view of the mechanism shown in Fig. 3;

Fig. 5 is a detail of Fig. 3 seen at right angles thereto, on anenlarged scale;

Fig. 6 is a side elevation, partly in section, of the left part of Fig.3, showing some details seen along the line VIVI of Fig. 8;

Fig. 7 is a partial side elevation of an enlarged scale United StatesPatent 0 of the device shown in Fig. 6, seen at right angles theretofrom the rear;

Fig. 8 is a plan view of the device shown in Figs. 6 and 7;

Fig. 9 is an elevation of a detail of Figs. 3 and 4 seen in thedirection of the arrow IX in Fig. 3;

Fig. 10 is a schematical top plan View of the main parts of themechanism shown in Fig. 1 similar to Fig. 1 of U.S. Patent No.2,879,938;

Fig. 11 is a perspective view of certain details shown in Figs. 6 and 8and of additional parts;

Fig. 11a is a perspective view of a part adapted for cooperation withFig. 11; and

Fig. 12 is an elevation of apart of Fig. 11.

Referring now to the drawings in detail, and first to Figs. 1 and 10,carriage 4 (Fig. 1) is shiftably mounted on a shaft 2 of a calculatingmachine having a frame 3, the shaft 2 being arranged in the frame 3 forrotation by a handle or crank. The carriage 4 carries a rotarydifferential actuator 4, comprising a plurality of denominationallyspaced pin wheels '9 which may be adjusted, respectivey, by cam disks 9known in the art to project a plurality of pins 10, displaceable in pinwheels 9, in a radial direction. A spring 5 urges carriage 4 andactuator 4 to the left as seen in Fig. 1, whereas a wire 7 (Fig. 1),loaded by a tension spring 8, is provided with a stop 6 for engaging andmoving the carriage 4 to the right into its initial rightmost position,against the action of the spring 5, during a normalizing operation.

In order to introduce values in the actuator 4 digit keys 11 aresequentially depressed as more fully described in German Patent No.907,836 and the corresponding U.S. Patent No. 2,879,938 issued toEberhard Menge on March 31, 1959, reference to which is made. Depressionof one of the digit keys 11 causes the associated toothed cam disk 9 torotate through an angle corresponding to the digit value represented bythe depressed key. Such rotation of the cam disk 9' causes a cam groovetherein to radially project a number of pins 10 (Fig. 10) from thecorresponding pin wheel 9. The cam disks 9 are. rotated by a toothedsegment (not shown) operated by the digits keys 11 which engages theteeth of the cam disk 9 located directly to the right of the unitdenomination 18 of an accumulator 18 having a set of digit wheels 18arevolvable about the axle 78 so as to assume any digit positionincluding a zero position.

After completing the value-introducing movement for the highest leftdenominational order of a number, the actuator carriage 4' is shifteddenominationally to the left so that the value indexing operationdescribed hereinabove may be repeated for the next lower denominationalorder of the number.

After a desired number has been introduced into the actuator 4, it istransmitted to the accumulator 18 by intermediate wheels 19 forming partthereof, the wheels 19 being actuated by the pins 10 projecting radiallyfrom the pin wheels 9 when actuator 4 rotates.

Simultaneously the number of complete revolutions of the shaft 2 isregistered in a revolutions counter 20 (Fig. in a known manner. Therevolutions counter is provided with a set of digit wheels 20' and a setof intermediary wheels 24 adapted to be engaged by the pins 10 radiallyadvanced by introducing a number into the actuator 4, if the latter isrotated after being shifted again to the right to a desired positionopposite the revolutions counter 20.

The actuator 4 may be moved from any position opposite the accumulator18 or the revolutions counter 23 by a partial step to the right to aposition in which the intermediary wheels 19 or 24 engage the toothedportions 9" of the cam disks 9 to enable retransmission of either theaccumulator 18 setting or the revolutions counter 20 setting into theactuator 4 by a rotation of the shafts 78 or 83 which zeroize theaccumulator 18 and the revolutions counter 20, respectively.

The actuator 4 has to be brought into engagement witha Zeroizing device22 (Figs. 1 and 6) which is supported with the actuator 4 by theshiftable carriage 4 The Zeroizing device 22 comprises a set of partlytoothed wheels 22, having an interdental space, shiftably mounted on ashaft 21. The number of wheels 22 equals the number of cam disks 9. Uponrotation of the shaft 21 by a sprocket wheel 87, driven by a chain 86;,more fully disclosed in the Germany Patent No. 907,836 corresponding tothe U.S. Patent No. 2,879,938 mentioned hereinabove, the teeth of theWheels 22 engage, respectively, the

toothed portions 9" of the cam disks 9, as more fully described withreference to Fig. 3 of the German Patent No. 907,836 and thecorresponding U.S. Patent No. 2,879,938 mentioned hereinabove. Controlrings 9" alternate with the cam disks 9; their function will beexplained in connection with the subject matter of Figs. 6, 7 and 8under the heading Zero adjustment of the auto matic tabulation of thecarriage.

TOTAL RETRAN SF ER Four operational keys 25 to 28 are arranged, as shownin Fig. 10, on the keyboard of the calculating machine. The operationalkey 25 is a retransmitting key; the keys 26, 27 and 28 are,respectively, zeroizing keys for the actuator 4, the accumulator 18 andthe revolutions counter 20. In Fig. 1 thestems 25, 26, 27 and 28 of theoperational keys 25' to 28 are shown, respectively. Furthermore, a key90', shown also in Fig. 2, is arranged somewhat out of alignment withthe keys 25 to 23 so that the stem 90 of the key 90' is arrangedadjacent the ends of slides 31 to 34, shown in Figs. 1 and 2. The slides31 to 34 are arranged parallel to one another and are slidably supportedin guides 35 (Figs. 1 and 2) forming part of the frame 3 of the machine,the slides being arranged in super-position. When the slides 31 to 34are shifted in the direction of the arrow x in Fig. 1, they move a slidemember 3", cooperating with all slides 31 to 34, to the right, the slidemember being normally held in its initial position, in which it engagesthe slides 31 to 34, by a tension spring 37. The slide member 36 isguided by projections 36 sliding between stationary parts 36" formingpart of the frame 3 of the machine.

By laterally shifting the slide member 36, a toothed wheel 38, whichrotates with the hand crank 1 and is shiftably mounted on the shaft 2 ofthe calculating machine, is shifted to the right against the action of aspring 39 inserted between the toothed wheel 38 and a hub 3' formingpart of the frame 3. By such movement to the right, a clutch 40,normally connecting crank 1 to shaft 2, is released and toothed wheel 38is brought into engagement with an intermediary toothed wheel 41engaging a toothed wheel 42 rigidly connected with a shaft 43. The shaft43 carries five partially toothed driving wheels 45 to 49, as more fullydisclosed in German Patent No. 907,836 and the corresponding U.S. PatentNo. 2,879,938 mentioned hereinabove. The common shaft 43, connected tothe toothed wheel 42 in gear with the toothed wheel 41, carries alocking disk 52 adapted to engage a locking pin 53 on each of the slides31 to 34, said parts being more fully described in German Patent No.907,836 and the corresponding U.S. Patent No. 2,879,938 mentionedhereinabove.

A gear segment 45a (Fig. l) on the driving Wheel 45 controls apartial-step ordinal shift of the actuator 4 to a retransmittingposition. When the slide 31 is shifted to the right, a projection on theslide 31 moves the gear segment 45a into engagement with a driven gearwheel 61, mounted on a hollow shaft 67 which is coaxial with andsurrounds a shaft 66. The hollow shaft 67 carries a cam disk 68 whichcooperates with one arm of a two-armed rocking lever 69. The other armof the rocking lever 69 engages a projection '70 of an escapement rack72. The escapement rack 72 (Figs. 1, 5 and 11) is provided withsaw-tooth recesses 71 and has studs 73 which slide in guides 73 formingpart of the frame 3 of the calculating machine. The recesses 71 may beengaged by either of two pawls 74 and 74', rigidly or rockably connectedto the carriage 4 of the actuator 4, the operation of which will be morefully explained hereinafter.

The operation or" the partial-step ordinal shift of the actuator 4 to aretransmitting position will now be explained. When rotated, the gearsegment 45a, meshing with the gear wheel 61, causes one completerevolution of the cam disk 68. At the beginning of this revolution, thecam swings the two-armed lever 69 on its pivot. The pin 70 of theescapement rack 72 is thereby shifted in an ordinal direction togetherwith the pawl 74 engaging the escapement rack 72 and secured to theactuator carriage 4 This shift involves a partial-step ordinal shift andmoves the actuator 4 to a retransmitting position in which theintermediate wheels 19 or 24 (Fig. 10) engage the teeth 9 of the camdisks 9. This enables retransmission of either the accumulator 13setting or the revolutions counter 20 setting into the actuator 4 by arotation of the respective shafts 78 or 83, which Zeroizes theaccumulator 18 or the revolutions counter 20, respectively.

The shaft '78 carries a sprocket 77 connected to a sprocket 75 by achain 76. The sprocket 75 (Figs. 1 and 10) is rigid with a shaft 66driven by the gear Wheel associated with partially toothed gear 46.Hence, rotation of the partially toothed gear 46 will zeroize theaccumulator 18.

The shaft 83 carries a sprocket wheel 82 driven by a chain 81 alsoengaging a sprocket wheel 81. The sprocket Wheel 81' is rotatable withthe driven gear associated with the partially toothed gear 47. Hence,rotation of the partially toothed gear will zeroize the revolutionscounter 20.

In addition to the operational keys 25 to 28 shown in Fig. 10, a furtheroperational key shown in Fig. 2, is provided; the key 90 has a stem 90and a projection 90". Upon depression of the operational key 90', theprojection 90 displaces all four slides 31 to 34 into their right-handpositions. Thus, the slide member 36 is actuated and, by opening theclutch 4t and coupling the toothed wheels 38 and 41, switches the driveof the crank 1 from the shaft 2 to the control shaft 43.

Since all four slides 31 to 34 have moved to their righthand positions,the projections thereon have shifted the respective partially tootheddriving gear wheels 45 to 49 into engagement with the driven gear wheelsaligned on shaft 66. Hence, when the crank 1 is driven, all fiveoperations are carried out one after the other by the shiftable,partially toothed driving gear wheels 45 to 49 in the sequencedetermined by the angular arrangement of the partial toothing thereon. Amore detailed disclosure is available in U.S. Patent No. 2,879,938.

The following table contains a summary of the control operationsaccording to the above mentioned German Patent No. 907,836 correspondingto U.S. Patent No. 2,879,938 in lines 1 to 6, whereas line 7 lists theadditional operation according to the present invention:

The locking pawl 74 is arranged on a member 95b (Fig. 5), loaded by aspring 95a, which is rotatable Table Designation of control slide foroperational step No. Keys Key-operated control action Carriage Revolu-Carriage Actuator shiit to tions Accurnureturn zeroizing retranscounterlator to right mission zeroizlng zeroizlng position position (1) 26LActuator zerm' "inn 32 32 (2) 27- Accumulator zeroizing. 33 (3).--Revolutions counter zer 34 (4) I V Total 7erni7ine' 32 34 33 32 (5)Retraosfer from accumulator to 31 31 33 27. actuator. (6) {25-Retransfer from revol. counter to 31 31 34 28 actuator. (7) 90' Totaltransfer with carriage return. 31, 32 31 34 33 32 AUTOMATIC TABULATIONOF THE CARRIAGE TO THE LEFT After a total retransmission effected by key90', the carriage 4 is in a position all the way to the right in Fig. l,the actuator being adjusted to the value received rom the denominationalplaces of the revolutions counter 26 opposite which it was arrangedbefore the beginning of the total retransmission procedure.

In this initial right-most position, the value may be retransmitted intothe revolutions counter 20 by means of a rotation of the crank 1 which,as more fully explained in the German Patent No. 907,836 and thecorresponding U.S. Patent No. 2,879,938, after the end of the operationis automatically coupled by the clutch 40 to the driving shaft 2 of theactuator 4. It should be noted that, as a rule, the accumulator 18 isspaced apart by several denominational orders from the counter 20 foraccommodating the. bearings arranged between the shafts 78 and 83.Although this expedient is not absolutely required, it avoids confusionof the numbers printed by the accumulator 1'8 and the revolutionscounter 20. Since in the right-most position of actuator 4, the twoleft-most orders thereof are aligned with the space between theaccumulator and counter, as shown in Fig. 10, these two left-most ordersof actuator 4 can not be used for "a retransmission into the revolutionscounter 20.

For transferring retransmitted values into the accumul'ator 18, thecarriage 4 of the actuator 4 must be shifted to the left so as to alignits right-most significant denominational order with the right-mostdenominational order 18' of the accumulator 18. A single tooth slide,more fully described in U.S. Patent No. 2,108,596, issued on February15, 1938 to K. V. Rudin for Calculating Machine, and particularlydescribed on page 4, left column, line 66, to page 5, right column, line31 and shown in Figs. and 31 thereof, remains opposite the first placeof the revolutions counter 20.

As shown in Figs; 1, 3 and 5, the escapement rack 72, provided with:sawtooth recesses 71, is rockable about the bearings or guides 73 andunder the pressure of a compression spring 91, is urged against a stopmember 93. A key 94 (Figs. 1, 3 and 11a) controls denominationalescapement of the carriage 4 along the escapement rack 72. Pressure onthe key 94 results in a small rotation of the escapement rack 72 aboutthe pivots 73 in a clockwise direction as seen in Fig. 3. Upon releaseof the key 94, a single step escapement towards the left is effected bythis rotation of the escapement rack 72, the saw-tooth recesses 71 ofthe escapement rack 72 engaging first a gripping pawl 74' and then alocking pawl 74 which are both arranged on a projection 74a (Figs. 3 and4)- of theearriage 4 about the axle 95 and intercepted by the part 96.When the carriage 4 is shifted towards the right (Fig. l), the lockingpawl 74 is depressed by and passes over the sawteeth 71 of theescapernent rack 72. In order to release the carriage 4 for a motion tothe left, Fig. l, the locking pawl 74 must be depressed and freed fromthe sawtooth recesses 71.. To this end, the member 95b is provided witha laterally projecting lug 74" which engages an elongated rocking member97 (Figs. 3, 4, 5, 8 and 11) during the entire traverse of the carriage4 towards the left. The rocking member 97, referred to hereinafter asthe left-shift rocker," is effective during a shift toward the left. Itis supported by pivots 93 and urged against the stop member 93 by thelower end of the spring 91 (Fig. 3). At the point marked by the arrow 99in Figs. 3 and 4, a key 99 (Fig. 11a) causes an anticlockwise rockingmotion in. Fig. 3 of. the left-shift rocker 97 which depresses thelocking pawl 74 and releases the saw-tooth recesses 71 of the escapementrack 72. Now the carriage 4 urged by the tension of its spring 5, movesleftward until it reaches its extreme left position, unless it isstopped in this path for instance by a premature engagement of thesaw-tooth recesses 71 by the locking pawl 74.

COUPLING OF THE SINGLE TOOTH SLIDE WITH THE CARRIAGE OF THE ACTUATOR Apawl 138 is supported by a pivot 137 at the right of the carriage 4(Figs. 11 and 12) and is held by a shoulder 138' on the lower end of asecond pawl 140 on a shaft 139. The pawls 138 and 148 are held in theposition shown in Fig. 1-2 by a tension spring 141 attached to off-setflanges thereof. The pawl 141 has an arm 140" with a double slopecooperating with a cam or pin (not shown) which revolves with theactuator 4. During each revolution of the actuator 4, the arm 140" andthus the pawl 149 are rotated about the pivot 139 sothat its end 140'slides off the shoulder 138 and releases the pawl 138 which is rotatedby the spring 141 about its pivot 137. The right or posterior end of thepawl 138 upon release engages. between teeth 142' of a bar 142 of acounting tooth slide, Whereas before the pawl 138 was free to slide.over the teeth 142 without being influenced. The bar 142, supported inthe machine frame, outflanks with fork-shaped arms 142" the countingtooth slide (not shown) which is shiftably arranged on the main drivingshaft and advances in. a manner known per se in the art by one. tooththe oppositely arranged wheel of the revolutions counter 21) or theintermediary wheel thereof at each revolution of the actuator 4.

It will be realized that the. pawl 138 does not engage teeth 142 duringthe adjustment shifts of the actuator involving a shift but no rotationof the actuator, so that the bar 142 which guides the counting toothslide (not shown) and the latter remain at rest during these steps.However, when a transmitting revolution is carried out with the actuator4 set to a certain value, the pawl 140 releases the pawl 138. The pawl138 is now freed to engage the teeth 142', whereby the guide bar 142couples the counting tooth slide (not shown) to the carriage 4 for acommon step-by-step motion.

The operation relative to the transfer of a dividend will now bediscussed. When the counting tooth slide (not shown) reaches its extremeleft-hand position and the carriage 4 of the actuator is further shiftedto the left, the pawl 138 slides along the inclined sides of the teeth142 into the respective next tooth gaps. The shoulder 138' of the pawl138 is not displaced sufficiently to allow the end 140' of the pawl 140to pass beyond the shoulder 138' so that the pawl 138 remains inengagement with the teeth 142', and the counting pawl slide (not shown)remains coupled to the carriage 4 of the actuator 4.

When the carriage 4 of the actuator 4 is moved by the wire 7 towards itsextreme right-hand position, the guide bar 142 of the counting toothslide (not shown) reaches its right-hand position and comes to a stop.During a further movement of the carriage 4 the pawl 138 slides towardsthe right along the inclined tooth flanks into the respective adjacentgaps of teeth 142. When the carriage 4 reaches its extreme right-handposition, the outer or rear end of the pawl 138 engages an inclined face(not shown) and is lifted thereby so that the end 140 comes to lieagainst the shoulder 138. Thereafter, when the carriage 4 is tabulatedto the left for setting a new value in the actuator 4, the pawl 138remains in its initial setting, shown in Fig. 12, in which the pawl 138is out of contact with the teeth 142' until a revolution of the actuatoris effected and the pawl 140, by engagement of the above-mentioned camor pin (not shown) with one of the arms 140", releases the pawl 138 sothat the latter may engage the teeth 142'.

If a value-setting operation of the actuator 4 is followed by ordinalescapement of the carriage 4 or by tabulation thereof to the left-endposition, the counting tooth slide (not shown) has to participate inthese movements to the left. To this end the pawl 140 has to bedisengaged not only by revolution of the actuator 4, but

also by the two left-shift keys 94 and 99. In order to accomplish this,an arm 144 (Figs. 11 and 12) is connected with the pawl 140 and has anextension 144' arranged in front of an edge 145' of a control slide 145.The arm 144 may be rocked from the front to the rear in the machine torock the pawl 140 in the same direction as the cams or pins (not shown)of the carriage 4 engaging the inclined ends 140". The slidably mountedcontrol slide 145 is moved by means of a lug 145" thereon which isengaged by inclined faces 94" and 99" on the keys 94 and 99,respectively, when either of these keys is depressed so as to force thelug 145" to the rear.

It will be realized by those skilled in the art that the operation ofthe described coupling of the counting tooth with the carriage 4 of theactuator 4 corresponds to the coupling shown in Figs. 31 and 32 of US.Patent No. 2,108,596 issued on February 15, 1938, to K. V. Rudin for aCalculating Machine.

AUTOMATIC RELEASE OF THE TABULATION OF THE CARRIAGE In order toautomatically control the leftward tabulation of the actuator carriage 4'to align the rightmost denominational order of the actuator 4 with therightmost denominational order of the accumulator 18 in the totalretransfer operation according to the invention, the mechanism describedhereinafter with reference to Figs. 3, 4, and 9 is provided. 4

At a suitable place in the machine, preferably at the right end of theleft-shift rocker 97, there is arranged an automatic tabulation controlslide 120 having a forwardly extending arm 120'. The control slide 120is rockable about an axle 121 on which it is supported so as to beaxially displaceable. A weak spring 122 urges the slide 120 and the arm120 thereof against a stop 123 fixed in the machine and formed, forinstance, by a face of an adjustable lever 127 supported by the shaft127' which is fixedly connected with the frame of the machine. Theoperation of the lever 127 will be explained in more detail hereinafter.

A cam 124 is arranged on one of the toothed driving wheels 45-49 whichare axially displaceable, for instance, on the wheel 45, which effects apartial step ordinal shift of the actuator carriage 4 for the retransferoperation. When axially displaced, the cam 124 engages a projection 125of-a bellcrank lever 125 supported by the axle 125a, or of a swingingrocker (not shown) and rotates the same in counterclockwise directionupon a rotation of the control shaft 43. The other arm 125" of the lever125 engages the arm 120' of the slide 120 from below and lifts the sameduring the last phase of the rotation of the control shaft 43, that isduring the return travel of the carriage 41 toward the right.

When the arm 120' is lifted, it lifts the lug 97 of the member 97,rocking the member 97 in counterclockwise direction (Fig. 3) todisengage the pawl 74 in the same manner as when the left-shift key 99is depressed in the direction of the arrow (Fig. 3), the carriage 4being released to move toward the left by the spring 5. During thismotion, a stop 126 of the carriage 4 engages a forwardly extending lug120" of the slide 120 so as to move the same along toward the left untilthe arm 120' is withdrawn from below the lug 97 which slides off theedge 120" of the arm 120 (Fig. 4); locking pawl 74 is now released. Thistakes place when the locking pawl 74 is positioned to engage the toothof the saw-tooth recesses 71 that corresponds to the desireddenominational position of the carriage 4 i.e., with the rightmostdenominational order of the actuator 4 aligned with the rightmostdenominational order of the accumulator 18.

The operation of the arrangement described hereinabove is as follows:

Upon depression of the key the control shaft 43 is connected to crank 1for operation thereby and all five independent operations, namelyZeroizing of the actuator 4, displacement of the actuator 4 into adenominationally intermediate retransfer position, zeroizing of theaccumulator 18, zeroizing of the revolutions counter 20 and return ofthe actuator carriage 4 to the right are effected in the sequence justnamed. During the last-mentioned phase, the cam 124 imparts a swingingmotion to the bellcrank lever 125 so that its arm 125" imparts aswinging motion to the arm 12%) of the slide which in turn acts upon themember 97 through the lug or projection 97"so that the locking pawl 74is withdrawn from the saw-tooth recesses 71 of the escapement rack 72.In consequence thereof, the carriage 4 moves toward the left and, beforereaching the position in which the rightmost denominational order of theactuator 4 is aligned with the rightmost denominational order of theaccumulator 18, the carriage 4 starts to displace the slide 120 towardthe left. For this purpose, the stop 126 abuts against the stop 120 torelease the member 97 when the projection 97 slides off the edge 120'.The locking pawl 74 thereupon engages the saw-tooth recesses of theescapement rack 72 and stops the carriage 4 in the denominationalposition mentioned above. Thus, the carriage 4 and also the countingtooth slide (not shown), and more fully disclosed in U.S. Patent No.2,108,596 mentioned above, which has been arrested at the firstdenominational order of the revolutions counter 20 (Fig. 10) are readyfor a multiplication involving the retransferred amount.

Since the slide 120 has to operate only in the position of the carriagespecified hereinabove, the slide 120 may 9 be carried along by thecarriage 4 during further steps or shifts to the left until the carriage4 has reached its end position.

SUPPRESSION OF THE AUTOMATIC TABULATION OF THE CARRIAGE In order tosuppress the automatic tabulation of the carriage 4 to the left, ifdesired, the adjusting lever 127,

shown in Fig. 9 is provided. A stop face 123 and 128 are connected by anintermediary face 129. The position of the lever 127 shown in Fig. 9corresponds to a setting for controlling tabulation to the left.However, upon counterclockwise angular displacement from the shownposition, the mm 120 of the slide 120 is shifted toward the left by thestop face 128 so that the overlap of the arm 120' with the arm 125 orthe lug 97' or both is discontinued. Therefore, the cam 124 has noeffect on the member 97 and the carriage 4 remains in its righthand endposition when the handle or crank is actuated after a depress-ion of thecombined operations key 90.

ZERO ADJUSTMENT OF THE AUTOMATIC TAB- ULATION OF THE CARRIAGE Thecarriage 4 is stopped during a tabulation to the left in a position inwhich all denominational orders of the actuator 4 are arranged oppositethe right-hand denominational orders of the accumulator 18. If zeros areadjusted in the right-hand orders of the actuator 4, the correspondingorders of the accumulator 18 cannot be used for calculating purposes.For this reason, the stop 126 of the carriage 4 has to be advanced by somany ceding one by the same distance, as shown in Fig. 8.

The stop members 130 are controlled by the control rings 9", rigidlyconnected with the cam disks 9'. The control rings 9" havecircumferential recesses or grooves 131 (Figs. 6 and 7) which in thezero position are aligned with similar recesses or grooves 132 of thecam disks 9' of the actuator 4. In the rest position of the actuator 4,an arm 130 of the controllable stop member 130 engages the recess 132.This arm 130' is displaced as soon as the associated cam disk 9 isadjusted to a position differing from the zero position, i.e., to asignificant digit. The stop member 130 is thereby rocked incounterclockwise direction (Fig. 6) about the pivot 130a against theforce exerted by a spring 130k and is removed from the path of the stop120" of the slide 120 so that the latter is caught by the next stopmember 130 arranged to the right, as viewed in Figs. 1 and 10. Thus, assoon as the left cam disks 9' are adjusted to any position correspondingto a value, for instance, by a retransfer operation according to thepresent invention, the associated stop members 130 are rocked abouttheir pivots on shafts 130a. Thus the locking pawl 74 of the carriage 4engages the saw-tooth recesses 71 of the escapement rack 72 in thatdenominational position in which the lowest adjusted denominationalorder of the actuator is aligned with the rightmost denominational orderof the accumulator 18. For the case that zeros are adjusted in theactuator to the left (as viewed in Figs. 1 and 10) of orders havingsignificant digits set therein, or intermediate those orders havingsignificant digits set therein, follower extensions 130" of the stopmembers 130 overlap adjacent lower order followers 130 to the left andform, as it were, a living bridge, to lift those stop members 130 fromthe grooves 131, 132 which are in denominational orders set at zero tothe left (as viewed in Figs. 1 and 10) of any order having an adjustedvalue other than zero therein. Thus the stop members 130 remain ineffective position only in the denominational orders set at zero and onthe right of an adjusted value. Hence, according to the invention, thecarriage 4 of the actuator 4 is stopped by the stop 126 or by stopmembers 130 during tabulation to the left according to thedenominational position of the rightmost significant digit entered intothe actuator during the retransfer operation.

In the arrangement just described, in case of a tabulation of thecarriage to the left or of a tabulation followed by subsequentescapement of the carriage, and if a value has been adjusted in theleftmost orders of the actuator, the slide will be engaged and takenalong by one of the stop members correspondingly far to the left so thatunder certain circumstances the space available for movement of theslide 120 to the left may be exceeded. Since the slide 120 has tooperate only in its initial position to the right, the stop members 130which are in normal, zero, position may be rotated by an inclined edge134 (Fig. 8) of a member, such as a rail 135, secured to the frame ofthe machine, into an ineffective position with respect to the stop lug120", the rail holding the members 130 in this position. This has thesimultaneous advantage, that the members 13%), after a correspondingdisplacement of the carriage 4 to the left, remain out of engagementwith the recesses or grooves 131, 132 in those orders to the left ofincline 134 during rotation of the actuator 4.

Thus, it is seen that the simultaneous zeroizing of the accumulator 18and of the revolutions counter 20 renders the selective retransfereither from the accumulator 18 or from the revolutions counter 20possible by previously shifting the carriage 4 of the actuator 4 intothe correctly aligned position in which the denominational orders of theactuator are arranged opposite the orders of the accumulator orrevolutions counter mechanism, whereas the remaining orders, forinstance of the other mechanism, are cancelled without further effects.Thus, also serial multiplication may be carried out quickly, since aftera retransfer, the accumulator and the revolutions counter are availablefor another multiplication involving the retransferred value. However,if it is required to retransfer a value from the accumulator or therevolutions counter without cancelling the value stored in the othermechanism, the procedure disclosed in German Patent No. 907,836 and thecorresponding US. Patent No. 2,879,938 mentioned hereinabove applies,namely pressing the normal retransfer key 25 in connection with the Zerokey for the transmission of definite values, whereupon the drive isactuated, the values stored in either the accumulator or the revolutionscounter are not cancelled, and the actuator 4 remains in its initialdenominational position.

It is intended that all matter contained in the above descrlption orshown in the accompanying drawings shall be interpreted as illustrativeand not in a limiting sense.

What is claimed is:

l. Ina calculator having a frame the combination comprising, an axlesupported in the frame, a counter mounted on said axle and having adenominational series of rotatable digit wheels; 21 second axlesupported in said frame coaxial with said first axle, an accumulatorhavmg a denominational series of rotatable digit wheels mounted on saidsecond axle; a third axle extending parallel to said first two axles andsecured to the frame, a denominationally shi table carriage mounted onsaid third axle for denominational displacement thereon and normallyurged to the left from an initial right-hand position, a cyclicallyoperable rotary differential actuator having a denominational series ofnumber wheel elements supported in said carriage, said number wheelelements each including means settable to operate said accumulator orsaid counter wheels upon cyclic rotation of said actuator and meansengageable by said accumulator wheels or said counter wheels to set saidsettable means upon zeroizing said accumulator or said counter, saidsettable means of said actuator number Wheel elements being adapted tocooperate with any plurality of said digit wheels ordinally alignedtherewith uponshifting said carriage; a first device, said first devicebeing adapted to zeroize the actuator and to shift said carriage by apartial step to align said engageable means of said number wheelelements of said actuator with a selected denominationally alignedplurality of adjacent digit wheels; a second device, said second devicebeing adapted to zeroize said actuator and to shift said carriage to itsinitial right-hand position; a third device adapted to zeroize saidaccumulator; a fourth device adapted to zeroize said counter; cyclicallyoperable drive means for said four devices, means for enabling saiddrive means in response to the enabling of at least one of said devices;said drive means operating said four devices in predetermined sequenceduring said cycle; an escapement rack supported on said frame, aspring-loaded pawl rockably mounted on said actuator carriage and havinga rack-release and a rackengaging position, said spring forcing saidpawl into the rack-engaging position; said rack and pawl being shaped toenable shifting of said actuator carriage to the right and for holdingof said actuator carriage against shifting to the left in therack-engaging position of said pawl; a pawl-rocking member engaging saidpawl in all shifted positions of said carriage and movable from a normalinoperative position to an operative position to rock said pawl to itsrack-releasing position; an axially shiftable control device urged to anormal axial position operably engaging said rocking member and beingoperable by said first device to move said pawl-rocking member into itsoperative position, said control device being engageable by saidactuator carriage upon movement to a selected denominational position toshift said control device out of operative engagement with saidpawl-rocking member, thereby enabling said pawl-rocking member torestore to its inoperative position at a predetermined location of theactuator carriage when the actuator is in ordinal alignment with thepredetermined plurality of digit wheels; and a manually operable controllever engaging said control device and effective upon adjustment fromnormal position to axially shift said control device out of operativeengagement with said pawl-rocking member.

2. In a calculator having a frame, an accumulator and a revolutionscounter each having a denominational series of digit wheels supported inaxial alignment in said frame, a dencminationally shiftable carriagesupported by said frame for movement parallel to said accumulator andsaid revolutions counter and normally urged to the left from an initialright-hand position, a cyclically operable rotary differential actuatorincluding an ordinal series of settable differential actuator elementssupported in said carriage on an axis parallel to said accumulator andrevolutions counter axis, said actuator elements being adapted tooperate the digit wheels of said accumu lator or said revolutionscounter upon cyclic rotation thereof and being adapted to be set by thedigit wheels of said accumulator or said revolutions counter uponzeroizing the latter, an automatic tabulation control device to shiftthe actuator carriage to the left from its initial right-hand positioninto ordinal alignment with a predetermined plurality of digit wheels,said tabulation control device comprising an escapement rack supportedon said frame, a spring-loaded pawl rockably mounted on said actuatorcarriage and having a rack-release and a rack-engaging position, saidspring forcing said pawl into the rack-engaging position; said rack andpawl being shaped to enable shifting of said actuator carriage to theright and for holding of said actuator carriage against shifting to theleft in the rack-engaging position of said pawl; a pawl-rocking memberengaging said pawl in all 'shifted positions of said carriage andmovable from a normal inoperative position to an operative position torock said pawl to the rack-releasing position; an axially shiftablecontrol device urged to a normal axial position operably engaging saidrocking member and being op-, erable by said first device to move saidpawl-rocking member into its operative position, said control devicebeing engageable by said actuator carriage upon movement to a selecteddenominational position to shift said control device out of operativeengagement with said pawl-rocking member, thereby enabling saidpawl-rocking member to restore to its inoperative position at apredetermined location of the actuator carriage when the actuator is inordinal alignment with the predetermined plurality of digit wheels, andmeans to actuate said control device.

3. In a calculator having a frame, the combination comprising, an axlesupported in the frame, a counter mounted on said axle and having adenominational series of rotatable digit wheels; a second axle supportedin said frame coaxial with said first axle, an accumulator having adenominational series of rotatable digit wheels mounted on said secondaxle; a third axle extending parallel to said first two axles andsecured to the frame, a denominationally shiftable carriage mounted onsaid third axle for denominational displacement thereon and normallyurged to the left from an initial right-hand position, a cyclicallyoperable rotary differential actuator having a denominational series ofnumber wheel elements supported in said carriage, said number wheelelements each including means settable to operate said accumulator orsaid counter wheels upon cyclic rotation of said acuator and meansengageable by said accumulator wheels or said counter wheels to set saidsettable means upon Zeroizing said accumulator or said counter, saidsettable means of said actuator number Wheel elements being adapted tocooperate with any plurality of said digit wheels ordinally alignedtherewith upon shifting said carriage; a first device, said first devicebeing adapted to zeroize the actuator and to shift said carriage by apartial step to align said engageable means of said numbers wheelelements of said actuator with a selected denominationally alignedplurality of adjacent digit Wheels; a second device, said second devicebeing adapted to zeroize said actuator and to shift said carriage toitsinitial right-hand position; a third device adapted to zeroize saidaccumulator; a fourth device adapted to zeroize said counter; cyclicallyoperable drive means for said four devices, means for enabling saiddrive means in response to the enabling of at least one of said devices;said drive means operating said four devices in predetermined sequenceduring said cycle; an escapement rack supported on said frame, aspring-loaded pawl rockably .mounted on said actuator carriage andhaving a rackrelease and a rack-engaging position, said spring forcingsaid pawl into the rack-engaging position; said rack and pawl beingshaped to enable shifting of said actuator carriage to the right and forholding of said actuator carriage against shifting to the left in therack-engaging position of said pawl; a pawl-rocking member engaging saidpawl in all shifted positions of said carriage and movable from a normalinoperative position to an operative position to rock said pawl to itsrack-releasing position; a slide, said slide being rockably mounted insaid frame, said slide being slidable along a path of motion parallel tosaid axles, a cam driven by said drive means, said slide being urged toa normal axial position operably engaging said pawl-rocking member andbeing operable by said cam to move said pawl-rocking member into itsoperative position, and a stop rigidly connected to said actuatorcarriage, said stop axially sliding said slide out of operativeengagement with said pawl-rocking member upon movement of said actuatorcarriage to a selected denominational position, thereby enabling saidpawlrocking member to restore to its inoperative position at apredetermined location of the actuator carriage when the actuator is inordinal alignment with the predetermined plurality of digit wheels.

4. In a calculator, the combination as claimed in claim 3, furthercomprising, a plurality of additional stops supported by said carriageand denominationally spaced from one another, said additional stopsbeing positioned to the left of said rigidly connected stop anddenominationally spaced therefrom, each of said additional stops beingassociated with one of said number wheel elements, said additional stopsbeing displaceable out of the path of said slide, a stop-adjustingmember for each of said additional stops, each stop-adjusting memberbeing actuated by the setting of said associated number Wheel element toa significant digit other than zero to displace said associated stop outof the path of said slide, and means responsive to a stop positionedoutside the path of said slide to remove from the path all stops ofhighest denominational order to the left of the removed stop.

5. In a calculator, the combination as claimed in claim 4, furthercomprising, a stop return member, said stop return member beingsupported at a predetermined location in the frame adjacent the path ofsaid carriage and denominationally spaced beyond the position at whichsaid stop or said additional stops engage said slide, said return memberbeing adapted to sequentially move any of said additional stops from thepath of said slide as said additional stops respectively are shiftedwith the carriage past said stop return member.

References Cited in the file of this patent UNITED STATES PATENTS1,371,138 Bair Mar. 8, 1921 1,867,002 Gardner July 12, 1932 2,108,596Rudin Feb. 15, 1938 2,531,206 Gang Nov. 21, 1950 FOREIGN PATENTS 907,836Germany Apr. 1, 1954 337,607 Great Britain Nov. 6, 1930

